plugins/mod_http_files.lua
author Kim Alvefur <zash@zash.se>
Fri, 21 Dec 2012 16:10:45 +0100
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permissions -rw-r--r--
mod_http_files: Log the error if we can't open or read a file
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-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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-- 
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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module:depends("http");
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local lfs = require "lfs";
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local os_date = os.date;
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local open = io.open;
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local stat = lfs.attributes;
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local build_path = require"socket.url".build_path;
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local http_base = module:get_option_string("http_files_dir", module:get_option_string("http_path", "www_files"));
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local dir_indices = module:get_option("http_files_index", { "index.html", "index.htm" });
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local show_file_list = module:get_option_boolean("http_files_show_list");
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local mime_map = module:shared("mime").types;
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if not mime_map then
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	mime_map = {
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		html = "text/html", htm = "text/html",
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		xml = "application/xml",
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		txt = "text/plain",
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		css = "text/css",
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		js = "application/javascript",
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		png = "image/png",
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		gif = "image/gif",
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		jpeg = "image/jpeg", jpg = "image/jpeg",
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		svg = "image/svg+xml",
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	};
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	module:shared("mime").types = mime_map;
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	local mime_types, err = open(module:get_option_string("mime_types_file", "/etc/mime.types"),"r");
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	if mime_types then
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		local mime_data = mime_types:read("*a");
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		mime_types:close();
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		setmetatable(mime_map, {
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			__index = function(t, ext)
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				local typ = mime_data:match("\n(%S+)[^\n]*%s"..(ext:lower()).."%s") or "application/octet-stream";
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				t[ext] = typ;
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				return typ;
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			end
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		});
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	end
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end
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local cache = setmetatable({}, { __mode = "kv" }); -- Let the garbage collector have it if it wants to.
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function serve_file(event, path)
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	local request, response = event.request, event.response;
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	local orig_path = request.path;
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	local full_path = http_base.."/"..path;
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	local attr = stat(full_path);
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	if not attr then
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		return 404;
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	end
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	local request_headers, response_headers = request.headers, response.headers;
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	local last_modified = os_date('!%a, %d %b %Y %H:%M:%S GMT', attr.modification);
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	response_headers.last_modified = last_modified;
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	local etag = ("%02x-%x-%x-%x"):format(attr.dev or 0, attr.ino or 0, attr.size or 0, attr.modification or 0);
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	response_headers.etag = etag;
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	local if_none_match = request_headers.if_none_match
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	local if_modified_since = request_headers.if_modified_since;
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	if etag == if_none_match
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	or (not if_none_match and last_modified == if_modified_since) then
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		return 304;
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	end
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	local data = cache[path];
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	if data and data.etag == etag then
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		response_headers.content_type = data.content_type;
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		data = data.data;
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	elseif attr.mode == "directory" then
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		if full_path:sub(-1) ~= "/" then
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			local path = { is_absolute = true, is_directory = true };
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			for dir in orig_path:gmatch("[^/]+") do path[#path+1]=dir; end
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			response_headers.location = build_path(path);
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			return 301;
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		end
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		for i=1,#dir_indices do
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			if stat(full_path..dir_indices[i], "mode") == "file" then
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				return serve_file(event, path..dir_indices[i]);
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			end
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		end
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		if not show_file_list then
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			return 403;
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		else
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			local html = require"util.stanza".stanza("html")
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				:tag("head"):tag("title"):text(path):up()
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					:tag("meta", { charset="utf-8" }):up()
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				:up()
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				:tag("body"):tag("h1"):text(path):up()
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					:tag("ul");
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			for file in lfs.dir(full_path) do
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				if file:sub(1,1) ~= "." then
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					local attr = stat(full_path..file) or {};
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					html:tag("li", { class = attr.mode })
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						:tag("a", { href = file }):text(file)
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					:up():up();
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				end
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			end
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			data = "<!DOCTYPE html>\n"..tostring(html);
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			cache[path] = { data = data, content_type = mime_map.html; etag = etag; };
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			response_headers.content_type = mime_map.html;
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		end
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	else
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		local f, err = open(full_path, "rb");
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		if f then
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			data, err = f:read("*a");
5252
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			f:close();
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   120
		end
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		if not data then
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			module:log("debug", "Could not open or read %s. Error was %s", full_path, err);
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			return 403;
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		end
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parents: 5253
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   125
		local ext = path:match("%.([^./]+)$");
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		local content_type = ext and mime_map[ext];
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		cache[path] = { data = data; content_type = content_type; etag = etag };
5253
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   128
		response_headers.content_type = content_type;
3353
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   129
	end
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parents: 5232
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   130
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	return response:send(data);
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end
1770
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parents: 1552
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   133
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   134
module:provides("http", {
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	route = {
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   136
		["GET /*"] = serve_file;
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   137
	};
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   138
});
1667
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Matthew Wild <mwild1@gmail.com>
parents: 1552
diff changeset
   139